<md-toolbar color="primary" class="mat-elevation-z5">
  <button md-icon-button (click)="openSidebar()">
    <md-icon>dashboard</md-icon>
  </button>
  <span>企业协作平台</span>
  <span class="fill-remaining-space"></span> 
  <md-slide-toggle (change)="onChange($event.checked)">黑夜模式</md-slide-toggle>
</md-toolbar>